corrade-nucleus-nucleons – Blame information for rev 20
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Rev | Author | Line No. | Line |
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20 | office | 1 | var ProtoList = require('proto-list') |
2 | , path = require('path') |
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3 | , fs = require('fs') |
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4 | , ini = require('ini') |
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5 | , EE = require('events').EventEmitter |
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6 | , url = require('url') |
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7 | , http = require('http') |
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8 | |||
9 | var exports = module.exports = function () { |
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10 | var args = [].slice.call(arguments) |
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11 | , conf = new ConfigChain() |
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12 | |||
13 | while(args.length) { |
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14 | var a = args.shift() |
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15 | if(a) conf.push |
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16 | ( 'string' === typeof a |
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17 | ? json(a) |
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18 | : a ) |
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19 | } |
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20 | |||
21 | return conf |
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22 | } |
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23 | |||
24 | //recursively find a file... |
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25 | |||
26 | var find = exports.find = function () { |
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27 | var rel = path.join.apply(null, [].slice.call(arguments)) |
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28 | |||
29 | function find(start, rel) { |
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30 | var file = path.join(start, rel) |
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31 | try { |
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32 | fs.statSync(file) |
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33 | return file |
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34 | } catch (err) { |
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35 | if(path.dirname(start) !== start) // root |
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36 | return find(path.dirname(start), rel) |
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37 | } |
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38 | } |
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39 | return find(__dirname, rel) |
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40 | } |
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41 | |||
42 | var parse = exports.parse = function (content, file, type) { |
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43 | content = '' + content |
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44 | // if we don't know what it is, try json and fall back to ini |
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45 | // if we know what it is, then it must be that. |
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46 | if (!type) { |
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47 | try { return JSON.parse(content) } |
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48 | catch (er) { return ini.parse(content) } |
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49 | } else if (type === 'json') { |
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50 | if (this.emit) { |
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51 | try { return JSON.parse(content) } |
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52 | catch (er) { this.emit('error', er) } |
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53 | } else { |
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54 | return JSON.parse(content) |
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55 | } |
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56 | } else { |
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57 | return ini.parse(content) |
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58 | } |
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59 | } |
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60 | |||
61 | var json = exports.json = function () { |
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62 | var args = [].slice.call(arguments).filter(function (arg) { return arg != null }) |
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63 | var file = path.join.apply(null, args) |
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64 | var content |
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65 | try { |
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66 | content = fs.readFileSync(file,'utf-8') |
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67 | } catch (err) { |
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68 | return |
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69 | } |
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70 | return parse(content, file, 'json') |
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71 | } |
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72 | |||
73 | var env = exports.env = function (prefix, env) { |
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74 | env = env || process.env |
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75 | var obj = {} |
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76 | var l = prefix.length |
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77 | for(var k in env) { |
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78 | if(k.indexOf(prefix) === 0) |
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79 | obj[k.substring(l)] = env[k] |
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80 | } |
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81 | |||
82 | return obj |
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83 | } |
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84 | |||
85 | exports.ConfigChain = ConfigChain |
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86 | function ConfigChain () { |
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87 | EE.apply(this) |
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88 | ProtoList.apply(this, arguments) |
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89 | this._awaiting = 0 |
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90 | this._saving = 0 |
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91 | this.sources = {} |
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92 | } |
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93 | |||
94 | // multi-inheritance-ish |
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95 | var extras = { |
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96 | constructor: { value: ConfigChain } |
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97 | } |
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98 | Object.keys(EE.prototype).forEach(function (k) { |
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99 | extras[k] = Object.getOwnPropertyDescriptor(EE.prototype, k) |
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100 | }) |
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101 | ConfigChain.prototype = Object.create(ProtoList.prototype, extras) |
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102 | |||
103 | ConfigChain.prototype.del = function (key, where) { |
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104 | // if not specified where, then delete from the whole chain, scorched |
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105 | // earth style |
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106 | if (where) { |
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107 | var target = this.sources[where] |
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108 | target = target && target.data |
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109 | if (!target) { |
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110 | return this.emit('error', new Error('not found '+where)) |
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111 | } |
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112 | delete target[key] |
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113 | } else { |
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114 | for (var i = 0, l = this.list.length; i < l; i ++) { |
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115 | delete this.list[i][key] |
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116 | } |
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117 | } |
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118 | return this |
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119 | } |
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120 | |||
121 | ConfigChain.prototype.set = function (key, value, where) { |
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122 | var target |
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123 | |||
124 | if (where) { |
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125 | target = this.sources[where] |
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126 | target = target && target.data |
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127 | if (!target) { |
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128 | return this.emit('error', new Error('not found '+where)) |
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129 | } |
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130 | } else { |
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131 | target = this.list[0] |
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132 | if (!target) { |
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133 | return this.emit('error', new Error('cannot set, no confs!')) |
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134 | } |
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135 | } |
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136 | target[key] = value |
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137 | return this |
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138 | } |
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139 | |||
140 | ConfigChain.prototype.get = function (key, where) { |
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141 | if (where) { |
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142 | where = this.sources[where] |
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143 | if (where) where = where.data |
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144 | if (where && Object.hasOwnProperty.call(where, key)) return where[key] |
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145 | return undefined |
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146 | } |
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147 | return this.list[0][key] |
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148 | } |
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149 | |||
150 | ConfigChain.prototype.save = function (where, type, cb) { |
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151 | if (typeof type === 'function') cb = type, type = null |
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152 | var target = this.sources[where] |
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153 | if (!target || !(target.path || target.source) || !target.data) { |
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154 | // TODO: maybe save() to a url target could be a PUT or something? |
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155 | // would be easy to swap out with a reddis type thing, too |
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156 | return this.emit('error', new Error('bad save target: '+where)) |
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157 | } |
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158 | |||
159 | if (target.source) { |
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160 | var pref = target.prefix || '' |
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161 | Object.keys(target.data).forEach(function (k) { |
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162 | target.source[pref + k] = target.data[k] |
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163 | }) |
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164 | return this |
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165 | } |
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166 | |||
167 | var type = type || target.type |
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168 | var data = target.data |
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169 | if (target.type === 'json') { |
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170 | data = JSON.stringify(data) |
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171 | } else { |
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172 | data = ini.stringify(data) |
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173 | } |
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174 | |||
175 | this._saving ++ |
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176 | fs.writeFile(target.path, data, 'utf8', function (er) { |
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177 | this._saving -- |
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178 | if (er) { |
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179 | if (cb) return cb(er) |
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180 | else return this.emit('error', er) |
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181 | } |
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182 | if (this._saving === 0) { |
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183 | if (cb) cb() |
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184 | this.emit('save') |
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185 | } |
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186 | }.bind(this)) |
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187 | return this |
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188 | } |
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189 | |||
190 | ConfigChain.prototype.addFile = function (file, type, name) { |
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191 | name = name || file |
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192 | var marker = {__source__:name} |
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193 | this.sources[name] = { path: file, type: type } |
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194 | this.push(marker) |
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195 | this._await() |
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196 | fs.readFile(file, 'utf8', function (er, data) { |
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197 | if (er) this.emit('error', er) |
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198 | this.addString(data, file, type, marker) |
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199 | }.bind(this)) |
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200 | return this |
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201 | } |
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202 | |||
203 | ConfigChain.prototype.addEnv = function (prefix, env, name) { |
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204 | name = name || 'env' |
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205 | var data = exports.env(prefix, env) |
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206 | this.sources[name] = { data: data, source: env, prefix: prefix } |
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207 | return this.add(data, name) |
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208 | } |
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209 | |||
210 | ConfigChain.prototype.addUrl = function (req, type, name) { |
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211 | this._await() |
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212 | var href = url.format(req) |
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213 | name = name || href |
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214 | var marker = {__source__:name} |
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215 | this.sources[name] = { href: href, type: type } |
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216 | this.push(marker) |
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217 | http.request(req, function (res) { |
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218 | var c = [] |
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219 | var ct = res.headers['content-type'] |
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220 | if (!type) { |
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221 | type = ct.indexOf('json') !== -1 ? 'json' |
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222 | : ct.indexOf('ini') !== -1 ? 'ini' |
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223 | : href.match(/\.json$/) ? 'json' |
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224 | : href.match(/\.ini$/) ? 'ini' |
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225 | : null |
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226 | marker.type = type |
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227 | } |
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228 | |||
229 | res.on('data', c.push.bind(c)) |
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230 | .on('end', function () { |
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231 | this.addString(Buffer.concat(c), href, type, marker) |
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232 | }.bind(this)) |
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233 | .on('error', this.emit.bind(this, 'error')) |
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234 | |||
235 | }.bind(this)) |
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236 | .on('error', this.emit.bind(this, 'error')) |
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237 | .end() |
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238 | |||
239 | return this |
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240 | } |
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241 | |||
242 | ConfigChain.prototype.addString = function (data, file, type, marker) { |
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243 | data = this.parse(data, file, type) |
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244 | this.add(data, marker) |
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245 | return this |
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246 | } |
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247 | |||
248 | ConfigChain.prototype.add = function (data, marker) { |
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249 | if (marker && typeof marker === 'object') { |
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250 | var i = this.list.indexOf(marker) |
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251 | if (i === -1) { |
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252 | return this.emit('error', new Error('bad marker')) |
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253 | } |
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254 | this.splice(i, 1, data) |
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255 | marker = marker.__source__ |
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256 | this.sources[marker] = this.sources[marker] || {} |
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257 | this.sources[marker].data = data |
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258 | // we were waiting for this. maybe emit 'load' |
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259 | this._resolve() |
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260 | } else { |
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261 | if (typeof marker === 'string') { |
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262 | this.sources[marker] = this.sources[marker] || {} |
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263 | this.sources[marker].data = data |
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264 | } |
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265 | // trigger the load event if nothing was already going to do so. |
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266 | this._await() |
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267 | this.push(data) |
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268 | process.nextTick(this._resolve.bind(this)) |
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269 | } |
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270 | return this |
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271 | } |
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272 | |||
273 | ConfigChain.prototype.parse = exports.parse |
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274 | |||
275 | ConfigChain.prototype._await = function () { |
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276 | this._awaiting++ |
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277 | } |
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278 | |||
279 | ConfigChain.prototype._resolve = function () { |
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280 | this._awaiting-- |
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281 | if (this._awaiting === 0) this.emit('load', this) |
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282 | } |